{
  "manageEntity": {
    "action": "Save",
    "entityId": "887864325",
    "entityType": "Track",
    "nonce": "0xcfdf969f996cc3a63905e5ed882d406123cb5408ede9ac692599611705970d34",
    "signature": "0x946ab4413e8c6844c017a918940c7953e5b2a2e5506f9f36ffd30523875a590c1e0fd6c30ce34734222ed7661d4b5d3ac3198a8a52a3dcea2f3255277e92c08a1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}